Don't chmod() if path is a symlink.

Lib/venv/__init__.py

@@ -215,6 +215,7 @@ class EnvBuilder:
                     # Issue 18807: make copies if
                     # symlinks are not wanted
                     copier(context.env_exe, path)
+                    if not os.path.islink(path):
                         os.chmod(path, 0o755)
         else:
             subdir = 'DLLs'